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/*
* Integer Rounding Functions
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ROUNDING_H_
#define BOTAN_ROUNDING_H_
#include <botan/types.h>
namespace Botan {
/**
* Round up
* @param n a non-negative integer
* @param align_to the alignment boundary
* @return n rounded up to a multiple of align_to
*/
inline size_t round_up(size_t n, size_t align_to)
{
BOTAN_ARG_CHECK(align_to != 0, "align_to must not be 0");
if(n % align_to)
n += align_to - (n % align_to);
return n;
}
/**
* Round down
* @param n an integer
* @param align_to the alignment boundary
* @return n rounded down to a multiple of align_to
*/
template<typename T>
inline constexpr T round_down(T n, T align_to)
{
return (align_to == 0) ? n : (n - (n % align_to));
}
/**
* Clamp
*/
inline size_t clamp(size_t n, size_t lower_bound, size_t upper_bound)
{
if(n < lower_bound)
return lower_bound;
if(n > upper_bound)
return upper_bound;
return n;
}
}
#endif
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